Periscope.



E. WEST.

PERISCOPE.

APPLICATION man JUNE 29.1918.

1,298,6 1 1 a Patented Mar. 25, 1919.

2 SHEETS-SHEET I.

E. WEST.

PERISCOPE.

APPLICATION FILED JUNE 29, 1918. 1,298,61 1 Patented Mar. 25, 1919.

2 SHEETS-SHEET 2.

wow M EARL WEST, OF SAN FRANCISCO, CALIFORNIA.

PERISCOPE.

Specification of Letters Patent.

' Patented Mar. 25, 1919.

Application filed June 29, 1918. Serial No. 242,582.

To all whom it may concern Be it known that I, EARL WEST, a citizen of the United States, residing at San Francisco, in the State of California, have invented new and useful Improvements in Periscopes, of which the following is a specification.

This invention relates to a periscope, and more particularly to an instrument comprising an upper and lower section, the lower section remaining intact and fully operative, for the purpose intended, in the event that the upper section is hit by a shell and carried away.

One object is to provide, in a device of the type indicated, a lower section carrying a head or casing at the upper end, and connected with said casing, an upper tubular member constituting an independent periscope section for use under the ordinary conditions, each of said sections including a reflector in its upper portion, the lower reflector being so mounted that it may be swung out of operative position when the upper periscope section is in use.

A still further object is to provide a periscope comprising an upper and lower section, the lower section being water-tight under all conditions and preventing the admission of water to the lower section in the event of the upper section being carried away by accident or by the impact of a shell. The sections are connected in a certain rovel manner described below, so that in the event of accident or injury from the causes named a break will occur between the two sections at the place indicated.

With the foregoing and other objects in view, the invention consists in the novel construction, combination, and arrangement of elements hereinafter described and claimed.

In the accompanying drawings,

Figure 1 is a side elevation.

Fig. 2 is a view of the device in vertical section.

Fig. 3 is a detail in verticalsection showing the oint between the two main elements of the periscope.

Fig. 4 is a section on the line 4-4 of Fig. 3.

Fig. 5 is a perspective view of a ring or collar which may subsequently be crinlped or corrugated slightly in the operation of clamping it between the two sections of the instrument.

The lower Periscope section is designated 10 and it carries a head or casing 12, having threaded connection at 13 with said section 10. One side of the casing is provided with an opening the threaded edges of which are engaged by the threaded lens-retaining device 15. The lens for the lower periscope section is shown at 16 and a reflector opposite said lens is dosignated 17. This reflector is hingedly mounted and is under the control of the flexible device 18 extending downwardly within the lower section, passing around the pulley 20 and having connection with the slidable device operating within a chamber 22, located as shown. A ring memher, or other suitable device 23, permits of the control of the flexible device 18 and the reflector 17. One side of the casing 12 is closed by means of a plate 25 suitably secured.

A sleeve 27 is threaded into the upper portion of the casing 12 and carries a lens or glass 28 suitably mounted.

The lens 28 is held in position by means of gasket 35, gasket 36 serving a similar purpose in connection with lens 34 mentioned below. Sleeve 27 is-engaged by collar 38 having an inwardly extending flange 39, and. this sleeve 27 is provided with an annular recess 40 receiving sleeve 29. A thin corrugated washer of brass or other suitable material is designated 41 and rests'on the upper edge of sleeve 27 and on flange 42 of sleeve 29, said collar 41 being engaged by a collar 43 retained by a lock nut 44.

An expansion ring 47, having the cross section shown, is located in annular recess 40 and abuts the beveled edge of flange 42. The thickness of collar 41 and its resistance to shearing strain determines the rigidity of the upper section of the device and permits fracture or separation at this point under the conditions above mentioned.

The sleeve 29 has threaded connection with the tube 30 of the upper section of the periscope, which section is in use under normal conditions. \Vithin sleeve 29 is mounted a lens or glass 34, for further insuring water-tight connection when the upper section is intact.

It will be understood that the reflector 17 is in a vertical position under usual condi tions and that it is only swung to an angle of approximately 45 degrees when the upper section has been carried away. or when for any reason it is desired to use the lens 16 for taking observations. The lenses of the re eiidi e' s, i ow ection cludi lens spective periscope sections may sometimes be of different power, making it desirable to use one or the other, "asthe case may be. If the upper section is carried away, the reflector 17 may at times be thrown to a vertical position in order to get an outlook directl'y' upward; 3 t .7

What is claimed is: 1. In a device of the class described, an upper per sepe seqtioniin l dinge [refl c o and lens, a lower. .section including a refle o and lens, ai se t o s b ing in ali flm tand means f r smne ng th e ti ns whereby in the, W nt \Qf a den s parati n Willocfiur atap in b t een hsi s- 2-1 a devi e o h l ss e r bed, an upp R T SCQP tio inclu ing a re-fleqtq nd a p vo a ly m nte refle r, means ontr l fieid 9 m efl er an an for ,co nec g the tw -z qtions v 11, a de ice of the, c as describ 1 1 ,1 upper Peri cope semi niinkcludin a eflecter endles a ow r.iseqtionzinqlud ng ref e te and l ns, end mean or-pr v nting 11 1 e r ju y Q he upper ,SQ i H trance of-Water to the lower secti'on in the event of accident to the upper section;

L/In a device of :the class described, an

upper periscope section, a lower periscopc section connected thereto and in alinement therewith, means carried by each of said sec tions for preventing the passage {of L'wajter,

therethrough,andrneans connecting the sctions permitting separation of the sections at the polnt of connect omnnthe ,eyent of n;

5- I ev e ef t e c e nidese i bed l wer e ion inn 'i d ng' tu ul ,m

an a casing Qarri ther y, a refle or and a, le s inputted ithin the sai easing, said reflector being pivotally supportedfgneans f ngi he reflector, a upp r periseeps section, m a s fq connswing lhe upper and lower segtim :@HldQQllfiWlfill w aken d@Q plingmn mean preventing the pessa epf water downward y int? the lower se on V f In testimonywhereof ,I affix mysignature,

em or [th patent m be ,q fe efid. l s w snt wenb l tr a inst e wwemi n r qf i r li I Washington, D, C. 

